All masses, great and small, in the electroweak interactions

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:7166550

Hauser, A I

The sensitivity of physical amplitudes to the observed isospin symmetry breaking in the fermion mass matrix is analyzed in the standard model of electroweak interactions and in theories where the symmetry breaking is dynamical. The author considers the nonlinear sigma model coupled to an SU(2) x U(1) Yang Mills theory and to fermions as a limit of the strongly interacting Higgs sector, and then he makes use of it as a model-independent description of the dynamical Higgs theories. The strengths of the different interactions induced in the nonlinear sigma model are discussed, in particular those that break isospin symmetry. New sources of isospin breaking are found in the technicolor models that he considers as representative of the dynamical Higgs theories. In particular there is one interaction that contributes directly to the rho parameter with a strength that is linear in the effective Yukawa coupling of the heaviest ordinary fermion. A functional integral formalism is adopted to try to deal with the case of a fourth generation of fermions with masses much heavier than the known fermions. Mixed contributions of Higgs fields and fermions to the rho parameter are computed.

• Research Organization: Yale Univ., New Haven, CT (USA)
• OSTI ID: 7166550
• Country of Publication: United States
• Language: English

Related Subjects

645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING CONSTANTS
FERMIONS
HIGGS MODEL
INTERACTIONS
ISOSPIN
MASS
MATHEMATICAL MODELS
MATRICES
NONLINEAR PROBLEMS
PARTICLE MODELS
PARTICLE PROPERTIES
SIGMA MODEL
SYMMETRY BREAKING
YANG-MILLS THEORY